EP4152566A1 - Electric motor stator and electric motor - Google Patents
Electric motor stator and electric motor Download PDFInfo
- Publication number
- EP4152566A1 EP4152566A1 EP21804818.9A EP21804818A EP4152566A1 EP 4152566 A1 EP4152566 A1 EP 4152566A1 EP 21804818 A EP21804818 A EP 21804818A EP 4152566 A1 EP4152566 A1 EP 4152566A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stator
- concave parts
- flat wire
- wire conductor
- flow passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004020 conductor Substances 0.000 claims abstract description 94
- 239000002826 coolant Substances 0.000 claims abstract description 51
- 238000004804 winding Methods 0.000 claims abstract description 17
- 230000002093 peripheral effect Effects 0.000 claims description 49
- 229910000831 Steel Inorganic materials 0.000 claims description 40
- 239000010959 steel Substances 0.000 claims description 40
- 125000006850 spacer group Chemical group 0.000 claims description 18
- 238000001816 cooling Methods 0.000 description 16
- 230000008859 change Effects 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
- H02K1/148—Sectional cores
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
Definitions
- the present disclosure relates to a stator for an electric motor and an electric motor using the stator.
- Patent Literature 1 discloses a stator for an electric motor.
- the stator includes multiple teeth portions for each of which a winding is formed by winding a flat wire conductor in multiple rows, and a coolant flow passage is provided between the windings.
- Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2004-242368
- An object of the present disclosure is to provide a stator advantageous for improving the cooling efficiency, and an electric motor using the stator.
- a stator includes a coil of a winding of a flat wire conductor, a stator core including a slot for housing a part of the coil, and a flow passage part through which a coolant flows, provided between a wall part of the slot and an outer surface of the coil facing the wall part, wherein an extension shape of the flow passage part from an inlet to an outlet for the coolant changes along an axial direction of the stator core.
- the flow passage part may be a concave part formed on the wall part of the slot.
- the wall part of the slot includes a wall surface adjacent to the concave part, the wall surface contacting with the coil through an insulating member.
- the above-described stator may include a spacer between the wall part of the slot and the outer surface of the coil facing the wall part, wherein the flow passage part may be a concave part formed on an outer peripheral part of the spacer.
- the concave part may be formed on the outer peripheral part of the spacer, the outer peripheral part facing the outer surface of the coil, and the outer peripheral part of the spacer includes an outer peripheral surface adjacent to the concave part, the outer peripheral surface contacting with the coil.
- the flat wire conductor may be stacked in layers along a radial direction orthogonal to the axial direction of the stator core, and the concave part is arranged as a plurality of concave parts, and the plurality of concave parts are opposed to each other for every layer of the flat wire conductor in the radial direction with a thickness of the flat wire conductor as one unit.
- the flow passage part may be a combination of a plurality of concave parts formed on a side surface part of the flat wire conductor.
- the side surface part of the flat wire conductor includes a side surface adjacent to each of the concave parts, the side surface contacting with the wall part of the slot through an insulating member.
- the flat wire conductor may be stacked in layers along a radial direction orthogonal to the axial direction of the stator core, and each of the concave parts may be formed with a thickness of the flat wire conductor as one unit in the radial direction.
- a stator includes a coil of a winding of a flat wire conductor, a stator core including a plurality of electromagnetic steel plates axially stacked and a slot for housing a part of the coil, and a flow passage part through which a coolant flows, formed on a wall part of the slot, wherein the electromagnetic steel plates include a plurality of concave parts formed thereon, the plurality of concave parts each having a thickness of each of the electromagnetic steel plates as one unit, the flow passage part includes a flow passage formed with a combination of the concave parts, and the concave parts are different in position, size, or number between the electromagnetic steel plates.
- the flat wire conductor may be stacked in layers along a radial direction orthogonal to the axial direction of the stator core, and a combination pattern of the concave parts may be defined in the radial direction with a thickness of the flat wire conductor as one unit.
- a combination pattern of the concave parts may be defined by stacking a first set of multiple electromagnetic steel plates having the same position, size, and number of concave parts and a second set of multiple electromagnetic steel plates having the same position, size, and number of concave parts, and at least one of the position, the size, or the number is different between the concave parts included in the first set and the concave parts included in the second set.
- a stator includes a coil of a winding of a flat wire conductor, a stator core including a slot for housing a part of the coil, and a flow passage part through which a coolant flows, formed on a side surface part of the flat wire conductor, wherein the flow passage part is a combination of a plurality of concave parts formed on the flat wire conductor.
- the flat wire conductor may be stacked in layers along a radial direction orthogonal to an axial direction of the stator core, and in the slot, a section of the flat wire conductor having concave parts formed thereon and a section of the flat wire conductor having no concave parts formed thereon may be stacked on each other.
- An electric motor includes a stator and a rotor configured to rotate with a magnetic field generated by the stator, wherein the stator is a stator described above.
- the present disclosure provides a stator advantageous for improving cooling efficiency, and an electric motor using the stator.
- Fig. 1 is a sectional view of the configuration of an electric motor 1 according to some embodiments, the electric motor 1 including any of the stators described in detail below.
- the electric motor 1 includes a stator 2, a rotor 3, and a case 4.
- the electric motor 1 makes the rotor 3 rotate using a magnetic field generated in the stator 2.
- the electric motor 1 according to the present embodiment includes a cooling mechanism through which a coolant C flows, thereby cooling the stator 2.
- the stator 2 includes a stator core 10 and a coil 40. Note that in Fig. 1 , the stator core 10 drawn above the rotor 3 is a cross section including the coil 40. In contrast, the stator core 10 drawn below the rotor 3 is a cross section not including the coil 40.
- the stator core 10 has a tubular shape as a whole and is a stacked body formed by stacking multiple electromagnetic steel plates 10a in the axial direction, each of which is a board made from a magnetic body.
- the coil 40 is a winding formed by winding a flat wire conductor 41 in multiple layers.
- the stator 2 according to the present embodiment includes a flow passage part through which the coolant C flows, and the specific structure and the like of the stator 2 is described in detail below.
- the rotor 3 is arranged in an inner space of the stator 2 and includes an armature core 3a in a cylindrical shape formed by stacking multiple electromagnetic steel plates, not illustrated, in the axial direction, and a rotating shaft 3b.
- the armature core 3a has a permanent magnet, which is not illustrated.
- the rotating shaft 3b is press-fitted in an insertion hole formed in an axial center part of the armature core 3a.
- the case 4 houses the stator 2 and the rotor 3 inside with at least one end of the rotating shaft 3b exposed to the outside.
- the case 4 is made from metal and has an outer peripheral wall part 4a, an inner peripheral wall part 4b, a first bottom wall part 4d, and a second bottom wall part 4e.
- the outer peripheral wall part 4a is a tubular member for connecting and holding the stator 2 by press-fitting the outer peripheral part of the stator 2 therein.
- the inner peripheral wall part 4b is a tubular member having an outer diameter and an inner diameter, which is inside the outer peripheral wall part 4a and is in a space between the stator 2 and the rotor 3.
- the inner peripheral wall part 4b has a hole part 4c at a position substantially opposed to the inner peripheral part of the stator core 10.
- the hole part 4c is filled with a resin wall 5.
- the resin wall 5 covering the hole part 4c is in contact with the stator core 10 and is not in contact with the rotor 3.
- the first bottom wall part 4d is a member in a plate shape connected to one opening end of the outer peripheral wall part 4a and the inner peripheral wall part 4b through welding, for example.
- the first bottom wall part 4d is provided with a first bearing 6 in an opening part thereof through which the rotating shaft 3b penetrates.
- the first bearing 6 rotatably supports one end of the rotating shaft 3b.
- the second bottom wall part 4e is a member in a plate shape, which is opposed to the first bottom wall part 4d in the axial direction, and is connected to the other opening end of the outer peripheral wall part 4a and the inner peripheral wall part 4b through welding, for example.
- the second bottom wall part 4e is provided with a second bearing 7 in an opening part thereof through which the rotating shaft 3b penetrates.
- the second bearing 7 rotatably supports the other end of the rotating shaft 3b.
- the case 4 Since the stator 2 is arranged in a close manner to the outer peripheral wall part 4a and the inner peripheral wall part 4b as described above, the case 4 has formed therein a first annular space S1 facing one end of the stator core 10 in the axial direction and a second annular space S2 facing the other end of the stator core 10 in the axial direction.
- the case 4 includes an inflow port 4f in the outer peripheral wall part 4a, which communicates with the first annular space S1 and the outside, and through which the coolant C flows in from a coolant supply unit installed outside.
- the case 4 includes an outflow port 4g in the outer peripheral wall part 4a, which communicates with the second annular space S2 and the outside, and through which the coolant C flows out to a coolant recovery unit provided outside. Since the stator 2 has the flow passage part through which the coolant C flows, the coolant C flowing in the first annular space S1 from the outside through the inflow port 4f is introduced from the first annular space S1 to the flow passage part in the stator 2. The coolant C flowing through the flow passage part in the stator 2 is then led to the second annular space S2 on the opposite side of the first annular space S1, and finally flows out of the second annular space S2 through the outflow port 4g.
- the electric motor 1 Due to the coolant C flowing in this manner, the electric motor 1 enables the heat generated in the coil 40 to be absorbed by the coolant C, thereby suppressing a temperature rise in the stator 2. That is, the entire flow passage of the coolant C including the flow passage part formed in the stator 2, the first annular space S1, and the second annular space S2 is the cooling mechanism included in the electric motor 1 according to the present embodiment.
- coolant C which can be employed in the present embodiment is not limited, and various coolant such as gas including nitrogen gas and oil can be employed.
- Fig. 2 is a partial cross-sectional view of the stator 2 corresponding to the part II-II in Fig. 1 , which is cut along a plane perpendicular to the axial direction. Note that Fig. 2 omits depictions of the case 4 and the resin wall 5.
- the stator 2 includes the stator core 10 and the coil 40 as described above.
- the stator core 10 includes multiple slots 23 arranged along the axial direction of the stator 2 and each housing a part of the coil 40.
- the stator core 10 is formed by combining multiple core members to mount mutually continuous parts of the coil 40 in respective slots 23.
- the stator core 10 includes multiple teeth portions 20 and a single tubular portion 30.
- the multiple teeth portions 20 are arranged at equal distances to the central axis of the stator core 10 and at equal intervals from each other in the circumferential direction of the stator core 10.
- each slot 23 is a space formed between teeth portions 20 adjacent to each other.
- the tubular portion 30 holds the multiple teeth portions 20 combined in an annular form, at the inner peripheral side of the tubular portion 30.
- An inner peripheral surface 21 of the annular body formed by combining the teeth portions 20 faces the outer peripheral surface of the armature core 3a of the rotor 3.
- an outer peripheral surface 22 of the annular body formed by combining the teeth portions 20 contacts with the inner peripheral surface of the tubular portion 30.
- Each of the teeth portions 20 includes a convex part 22a with the tip part wider than the base part on a surface facing the inner peripheral part of the tubular portion 30.
- the inner peripheral part of the tubular portion 30 includes multiple concave parts 31, which are each capable of engaging with the convex part 22a provided in each of the teeth portions 20.
- Fig. 2 exemplifies as a part of the stator core 10, two slots 23 adjacent to each other in the circumferential direction and three teeth portions forming these slots 23, that is, a first teeth portion 20a, a second teeth portion 20b, and a third teeth portion 20c.
- the flat wire conductor 41 constituting the coil 40 is stacked in layers along the radial direction orthogonal to the axial direction of the stator core 10.
- Fig. 2 illustrates a case where the flat wire conductor 41 is stacked in a total of eight layers in one slot 23, as an example. That is, the flat wire conductor 41 in this example includes eight layers which are, in order from the outermost peripheral side toward the innermost peripheral side, a first layer 41a, a second layer 41b, a third layer 41c, a fourth layer 41d, a fifth layer 41e, a sixth layer 41f, a seventh layer 41g, and an eighth layer 41h.
- the thickness of the flat wire conductor 41 is referred to as T41.
- the slots 23 each includes space opened from the inner peripheral surface 21 toward the rotor 3. After the coil 40 is installed in the slots 23, these spaces are filled with a resin material 60, and the coil is fixed in close contact with the slots 23.
- the stator 2 includes an insulating member 50 installed between the stator core 10 and the coil 40 for each slot 23.
- the insulating member 50 is insulating paper, for example.
- the stator 2 includes, for every slot 23, a flow passage part through which the coolant C flows from one end in the axial direction facing the first annular space S1 toward the other end in the axial direction facing the second annular space S2.
- the flow passage part is provided between a wall part of the slot 23 and an outer surface of the coil 40 facing the wall part.
- the wall part of the slot 23 here is basically a wall part facing the outer surface of the coil 40 in the circumferential direction of the stator core 10.
- the extension shape of the flow passage part from the inlet to the outlet for the coolant C in the stator core 10 changes along the axial direction of the stator core 10.
- the cross-sectional shapes and positions of the flow passage part change along the axial direction.
- the cross-sectional shapes of the flow passage part may include a region that does not change partially in the axial direction.
- Fig. 3 is a partial cross-sectional view of the stator 2 corresponding to the part III-III in Fig. 2 , which is cut along a plane along the axial direction and the radial direction orthogonal to the axial direction.
- the flow passage part according to the present embodiment is constituted by concave parts 24 formed on the wall part of the slot 23.
- the shape of the concave parts 24 can be set in various ways as long as the condition that the extension shape changes along the axial direction of the stator core 10 is satisfied.
- the shape of the concave parts 24, that is, the combination pattern of the concave parts 24, is defined according to the following criteria.
- the combination pattern of the concave parts 24 may be defined in the radial direction orthogonal to the axial direction of the stator core 10 with the thickness T41 of the flat wire conductor 41 as one unit.
- a width W24 of each concave part 24 in the radial direction is equal to the thickness T41 of the flat wire conductor 41.
- the concave parts 24 are opposed to each other in the radial direction for every layer of the flat wire conductor 41.
- Fig. 2 reference is made to the slot 23 between the first teeth portion 20a and the second teeth portion 20b.
- concave parts 24 formed on the first teeth portion 20a four concave parts 24 on the part illustrated in Fig.
- four concave parts 24 in the part illustrated in Fig. 2 each face any of the side surfaces of the second layer 41b, the fourth layer 41d, the sixth layer 41f, and the eighth layer 41h of the flat wire conductor 41.
- the convex parts 25 are adjacent to the concave parts 24 on the wall part of the slot 23.
- the convex parts 25 are parts remaining on the wall part of the slot 23 when the concave parts 24 are formed.
- wall surfaces adjacent to the concave parts 24 on the wall part of the slot 23, that is, wall surfaces 25a of the convex parts 25, contact with the coil 40 through the insulating member 50, as illustrated in Fig. 2 .
- the width W25 of each convex part 25 is equal to the thickness T41 of the flat wire conductor 41, and the convex parts 25 are opposed to each other for every layer of the flat wire conductor 41.
- FIG. 2 reference is made to the slot 23 between the first teeth portion 20a and the second teeth portion 20b.
- the wall surfaces 25a in the first teeth portion 20a four wall surfaces 25a of the part illustrated in Fig. 2 each contact with any of the side surfaces of the second layer 41b, the fourth layer 41d, the sixth layer 41f, and the eighth layer 41h of the flat wire conductor 41 through the insulating member 50.
- four wall surfaces 25a of the part illustrated in Fig. 2 each contact with any of the side surfaces of the first layer 41a, the third layer 41c, the fifth layer 41e, and the seventh layer 41g through the insulating member 50.
- the combination pattern of the concave parts 24 may be defined in the axial direction of the stator core 10 with the thickness T10 of each of the electromagnetic steel plates 10a forming the stator core 10 as one unit.
- the flow passage part as a whole is formed.
- the electromagnetic steel plates 10a are indicated by a broken line in Fig. 3 .
- the thickness T10 of each electromagnetic steel plate 10a employed in the present embodiment is about 2 mm.
- the condition that the extension shape of the concave parts 24 changes along the axial direction is satisfied by making the position, size, or number of the concave parts 24 different for each set of electromagnetic steel plates 10a.
- the combination pattern of the concave parts 24 includes a first set U1, a second set U2, and a third set U3, each of which is composed of multiple electromagnetic steel plates 10a and has the same position, size, and number of the concave parts 24 formed.
- the first set U1, the second set U2, and the third set U3 are compared with each other, the position, size, or number of concave parts 24 formed in each set is different among these sets.
- the first set U1 and the second set U2 are each a set of stacked five electromagnetic steel plates 10a of the same shape.
- the first set U1 and the second set U2 have the same size and number (four in the present embodiment) of the concave parts 24, but the positions of the concave parts 24 are displaced from each other by the width W24 of each concave part 24 in the radial direction of the stator core 10. That is, the concave part 24 and the convex part 25 are alternately present in the axial direction.
- the third set U3 is between the first set U1 and the second set U2.
- the concave part 24 included in the third set U3 has a shape in which the entire wall part of the slot 23 facing the entire side surface of the coil 40 is cut out. That is, the concave part 24 formed in the third set U3 connects the four concave parts 24 formed in the first set U1 with the four concave parts 24 formed in the second set U2.
- the coolant C introduced into the concave parts 24 from one side of the stator 2 in the axial direction flows toward the other side of the stator 2 in the axial direction while changing the traveling direction in a complicated manner by repeating merging and branching.
- the extension shape of the flow passage part in the stator core 10 from the inlet to the outlet for the coolant C can be various other than the combination pattern of the concave parts 24 illustrated in Fig. 3 .
- Fig. 4 is a diagram illustrating a combination pattern of the concave parts 24 as another example according to the present embodiment, in which the combination pattern of the concave parts 24 illustrated in Fig. 3 is modified. Note that Fig. 4 is a partial cross-sectional view of the stator 2 in accordance with Fig. 3 .
- the combination pattern of the concave parts 24 includes a first set U11, a second set U12, and a third set U13.
- the first set U11 and the second set U12 are each a set of five stacked electromagnetic steel plates 10a of the same shape.
- the first set U11 and the second set U12 have the same size and number (two in the present embodiment) of the concave parts 24, but the positions of the concave parts 24 are displaced from each other by the width W24 of each concave part 24 in the radial direction of the stator core 10.
- the concave part 24 and the convex part 25 are alternately present in the axial direction.
- the third set U13 is between the first set U11 and the second set U12.
- the concave part 24 included in the third set U13 has a shape necessary for connecting one concave part 24 formed in the first set U11 with one concave part 24 formed in the second set U12.
- the combination pattern of the concave parts 24 illustrated in Fig. 4 can include a part where the concave part 24 does not face any layers of the flat wire conductor 41. Referring to the drawing of Fig.
- the wall part of the slot 23 in the first teeth portion 20a has no concave parts 24 formed at parts, which face any of the first layer 41a, the second layer 41b, the sixth layer 41f, and the seventh layer 41g of the flat wire conductor 41.
- the coolant C introduced into the concave parts 24 from one side of the stator 2 in the axial direction flows toward the other side of the stator 2 in the axial direction while meandering.
- the stator 2 includes the coil 40 of a winding of the flat wire conductor 41, and the stator core 10 having the slots 23 for housing a part of the coil 40.
- the stator 2 includes the flow passage part through which the coolant C flows between the wall part of the slot 23 and the outer surface of the coil 40 facing the wall part.
- the extension shape of the flow passage part from the inlet to the outlet for the coolant C changes along the axial direction of the stator core 10.
- the stator 2 enables the coolant C to flow through the flow passage part included in the stator core 10, and thus enables the heat generated in the coil 40 to be absorbed by the coolant C, thereby cooling the stator 2.
- the extension shape of the flow passage part from the inlet to the outlet for the coolant C changes along the axial direction of the stator core 10.
- the flow of the coolant C is more likely to be turbulence than in a case where the flow passage part extends linearly, for example, and the flow passage part is more likely to crawl widely to fit the outer surface shape of the coil 40, thereby improving the cooling efficiency.
- the present embodiment provides the stator 2 advantageous to improve the cooling efficiency.
- the flow passage part is provided between the wall part of the slot 23 and the outer surface of the coil 40 facing the wall part.
- the electric motor 1 includes the stator 2 and the rotor 3 to be rotated using a magnetic field generated by the stator 2.
- the present embodiment provides the electric motor 1 advantageous to improve the cooling efficiency as the electric motor 1 includes the stator 2 achieving the effect described above.
- the electric motor 1 as described above can be advantageous for miniaturization and high output, accordingly.
- the flow passage part may be concave parts 24 formed on the wall part of the slot 23.
- the concave parts 24 are formed on the wall part of the slot 23, it is easy to set the shape of the concave parts 24 to a desired shape. In this case, additional components are not necessary when the flow passage part is provided in the stator 2, which can contribute to the simplification of the structure of the stator 2.
- the wall surfaces 25a adjacent to the concave parts 24 in the wall part of the slot 23 may contact with the coil 40 through the insulating member 50.
- stator core 10 firmly supports the coil 40 even when the flow passage part is provided between the wall part of the slot 23 and the outer surface of the coil 40.
- the flat wire conductor 41 is stacked in layers along the radial direction orthogonal to the axial direction of the stator core 10.
- the concave parts 24 may be opposed to each other for every layer of the flat wire conductor 41 with the thickness T41 of the flat wire conductor 41 as one unit in the radial direction.
- each of the concave parts 24 directly faces any of the multiple layers of the flat wire conductor 41, each layer being an individual heat source, thereby further improving the cooling efficiency.
- the stator 2 includes the coil 40 of a winding of the flat wire conductor 41, and the stator core 10 having the slot 23 for housing a part of the coil 40 and formed by stacking multiple electromagnetic steel plates 10a together in the axial direction.
- the stator 2 includes the flow passage part formed on the wall part of the slot 23 and through which the coolant C flows.
- the concave parts 24 each having the thickness T10 of the electromagnetic steel plate 10a as one unit are formed on the electromagnetic steel plates 10a.
- the flow passage part includes a flow passage formed with a combination of the concave parts 24. The position, size, or number of concave parts 24 is different for each set of electromagnetic steel plates 10a.
- the flow passage part is defined with the thickness T10, as one unit, of the electromagnetic steel plate 10a forming the stator core 10, and thus it is easy to determine the shape of the flow passage part when the stator core 10 is manufactured.
- the concave parts 24 may be formed on the electromagnetic steel plates 10a before the stator core 10 is assembled, or the concave parts 24 may be formed after the stator core 10 is assembled.
- the extension shape of the flow passage part is not at least in a linear shape. It is thus possible to make the extension shape of the flow passage part from the inlet to the outlet for the coolant C varied along the axial direction of the stator core 10 in a reliably manner.
- the flat wire conductor 41 is stacked in layers along the radial direction orthogonal to the axial direction of the stator core 10.
- the combination pattern of the concave parts 24 may be defined with the thickness T41 of the flat wire conductor 41 as one unit in the radial direction.
- the thickness T10 of the electromagnetic steel plate 10a is defined as one unit for the concave parts 24, it is possible to form the concave parts 24 to directly face multiple layers of the flat wire conductor 41, each of which is an individual heat source.
- the combination pattern of the concave parts 24 is defined by stacking the first set of multiple electromagnetic steel plates 10a having the same position, size, and number of concave parts 24, and the second set of electromagnetic steel plates 10a having the same position, size, and number of concave parts 24.
- at least one of the position, size, or number may be different from each other between the concave parts 24 included in the first set and the concave parts 24 included in the second set.
- stator 2 for example, before the stator core 10 is assembled, it is possible to prepare in advance electromagnetic steel plates 10a having a shape for the first set and electromagnetic steel plates 10a having a shape for the second set. In this way, by preparing some sets of electromagnetic steel plates 10a each having concave parts 24 of a specific shape, it is then possible to combine the electromagnetic steel plates 10a to easily manufacture the stator core 10 including the flow passage part formed of a combination of the concave parts 24.
- FIG. 5 is a partial cross-sectional view of the stator 102 contrasted with Fig. 2 of the first embodiment, which is cut along a plane perpendicular to the axial direction.
- Fig. 6 is a partial cross-sectional view of the stator 102 corresponding to the part VI-VI in Fig. 5 , which is cut along a plane along the axial direction and the radial direction orthogonal to the axial direction. Note that in Figs. 5 and 6 , the same components as those of the stator 2 according to the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the stator 102 includes, for every slot 123, a flow passage part through which the coolant C flows from one end in the axial direction facing the first annular space S1 toward the other end in the axial direction facing the second annular space S2. Also in the present embodiment, the flow passage part is provided between the wall part of the slot 123 and the outer surface of the coil 140 facing the wall part. The extension shape of the flow passage part from the inlet to the outlet for the coolant C changes along the axial direction of the stator core 110.
- the flow passage part in the first embodiment is concave parts 24 formed on the wall part of the slot 23.
- the flow passage part according to the present embodiment is a combination of multiple concave parts 143 formed on the side surface part of the flat wire conductor 141.
- the stator core 110 is a member corresponding to the stator core 10 in the first embodiment.
- the basic structure of the stator core 110 is equivalent to that of the stator core 10.
- the multiple teeth portions 120 included in the stator core 110 do not have concave parts formed thereon as the flow passage part.
- the coil 140 is a member corresponding to the coil 40 in the first embodiment.
- the flat wire conductor 141 constituting the coil 140 is stacked in layers along the radial direction orthogonal to the axial direction of the stator core 110.
- Fig. 5 exemplifies as an example a case where the flat wire conductor 141 is stacked in a total of eight layers in one slot 123. That is, the flat wire conductor 141 includes eight layers in order from the outermost peripheral side toward the innermost peripheral side, a first layer 141a, a second layer 141b, a third layer 141c, a fourth layer 141d, a fifth layer 141e, a sixth layer 141f, a seventh layer 141g, and an eighth layer 141h.
- T141 the thickness of the flat wire conductor 141 is referred to as T141 (see Fig. 6 ).
- the shape of the multiple concave parts 143 formed on the flat wire conductor 141 can be set in various ways as long as the condition that the extension shape of the flow passage part changes along the axial direction of the stator core 110 is satisfied.
- the shape of the concave part 143 is defined according to the following criteria.
- the multiple concave parts 143 may be defined in the stacking direction of the flat wire conductor 141 with the thickness T141 of the flat wire conductor 141 as one unit. That is, each of the concave parts 143 is formed by cutting out the side surface part of the flat wire conductor 141 along the stacking direction as a whole.
- multiple concave parts 143 may be defined by a constant length L1 with a constant interval L2 between adjacent concave parts 143.
- the interval L2 is shorter than the length L1.
- the length L1 and the interval L2 are defined such that multiple concave parts 143 are aligned in every other layer in the stacking direction from the first layer 141a to the eighth layer 141h.
- upper layer the upper layer
- lower layer the other layer
- the concave parts 143 formed on the upper layer and the concave parts 143 formed on the lower layer overlap each other in the stacking direction.
- the concave part 143 formed on the first layer 141a and the concave part 143 formed on the second layer 141b overlap each other in a first region R1. This enables the coolant C to flow in the stacking direction.
- the flow passage may include a second region R2 in which the concave part 143 of the upper layer and the concave part 143 of the lower layer do not overlap each other in the stacking direction. That is, a part of the concave part 143 of the lower layer can cover the convex part protruding toward the concave part 143 of the upper layer.
- the flow passage may include a pattern in which one concave part 143 of the lower layer covers multiple concave parts 143 of the upper layer.
- the coolant C introduced into the concave parts 143 from one side of the stator 102 in the axial direction flows toward the other side of the stator 102 in the axial direction while changing the traveling direction in a complicated manner by repeating merging and branching.
- the extension shape of the flow passage part in the stator core 110 from the inlet to the outlet for the coolant C can be various other than the combination of the concave parts 143 illustrated in Fig. 6 .
- Fig. 7 is a diagram illustrating a combination pattern of the concave parts 143 as another example according to the present embodiment, in which the combination of the concave parts 143 illustrated in Fig. 6 is modified. Note that Fig. 7 is a partial cross-sectional view of the stator 102 in accordance with Fig. 6 .
- a section of the flat wire conductor 141 with concave parts 143 formed in the same manner as in Fig. 6 and a section of the flat wire conductor 141 with no concave parts formed are stacked on each other.
- no concave parts are formed on the first layer 141a, the second layer 141b, the fifth layer 141e, and the sixth layer 141f of the flat wire conductor 141.
- the coolant C introduced into the concave parts 143 from one side of the stator 102 in the axial direction flows toward the other side of the stator 102 in the axial direction while meandering.
- stator 102 As an action and effect of the stator 102 described above, it is possible to provide the flow passage part between the wall part of the slot 23 and the outer surface of the coil 40 facing the wall part, as with the stator 2 according to the first embodiment. It is possible to change the extension shape of the flow passage part from the inlet to the outlet for the coolant C along the axial direction of the stator core 110. Therefore, the present embodiment provides the stator 102 advantageous for improving the cooling efficiency.
- the flow passage part may be a combination of multiple concave parts 143 formed on the side surface part of the flat wire conductor 141.
- the processing for providing the flow passage part is only the processing for forming the concave parts 143 on the side surface part of the flat wire conductor 141, it is easy and simple to form the flow passage part.
- the side surfaces 142 adjacent to the concave parts 143 in the side surface part of the flat wire conductor 141 may contact with the wall part of the slot 123 through the insulating member 50.
- the stator 102 described above enables the stator core 110 to firmly support the coil 140 even when the flow passage part is provided between the wall part of the slot 123 and the outer surface of the coil 140.
- the flow passage part itself faces the coil 140 without the insulating member 50, which can be advantageous to further improve the cooling efficiency.
- the flat wire conductor 141 is stacked in layers along the radial direction orthogonal to the axial direction of the stator core 110.
- the concave part 143 may be formed with the thickness T141 of the flat wire conductor 141 as one unit in the radial direction.
- the stator 102 includes the coil 140 of a winding of the flat wire conductor 141, and the stator core 110 including the slot 123 for housing a part of the coil 140.
- the stator 102 includes the flow passage part through which the coolant C flows, which is formed on the side surface part of the flat wire conductor 141.
- the flow passage part is a combination of multiple concave parts 143 formed on the flat wire conductor 141.
- the concave part 143 has a shape in which the side surface part of the flat wire conductor 141 is entirely cut off along the stacking direction, which enables the coolant C to flow across one concave part 143 in the stacking direction. Therefore, combining multiple concave parts 143 described above makes it easy to construct the flow passage part continuous as a whole.
- the flat wire conductor 141 is stacked in layers along the radial direction orthogonal to the axial direction of the stator core 110.
- a section of the flat wire conductor 141 with concave parts 143 formed and a section of the flat wire conductor 141 with no concave parts formed may be stacked on each other.
- stator 102 With the stator 102 described above, it is possible to widen the range of choice in the shape of the flow passage part, for example, by making the shape of the flow passage part as a meandering shape as illustrated in Fig. 7 .
- FIG. 8 is a partial cross-sectional view of the stator 202 contrasted with Fig. 2 of the first embodiment or Fig. 6 of the second embodiment, which is cut along a plane perpendicular to the axial direction. Note that in Fig. 8 , the same components as those of the stator 2 according to the first embodiment or the stator 102 according to the second embodiment are denoted by the same reference numerals, and description thereof is omitted.
- the stator 202 includes, for every slot 123, the flow passage part through which the coolant C flows from one end in the axial direction facing the first annular space S1 toward the other end in the axial direction facing the second annular space S2. Also in the present embodiment, the flow passage part is provided between the wall part of the slot 123 and the outer surface of the coil 40 facing the wall part. The extension shape of the flow passage part from the inlet to the outlet for the coolant C changes along the axial direction of the stator core 110.
- the stator 202 includes for each slot 123 a spacer 70 between the wall part of the slot 123 and the outer surface of the coil 40 facing the wall part.
- the flow passage part is concave parts 74 formed on the outer peripheral part of the spacer 70. The combination pattern of the concave parts 74 may be, for example, the same as the combination pattern of the concave parts 24 in the first embodiment.
- stator 202 In the stator 202 according to the present embodiment, although the number of components increases as the spacer 70 is provided, no flow passage part is formed in the stator core 110, nor in the coil 40. Therefore, for example, the electric motor 1 as a whole can be advantageous in terms of time and labor required for manufacturing, consequently in terms of manufacturing cost.
- the concave parts 74 may be formed on the outer peripheral part 75 of the spacer 70, facing the outer surface of the coil 40, and outer peripheral surfaces 75a adjacent to the concave parts 74 on the outer peripheral part 75 may contact with the coil 40.
- the concave parts 74 are formed on the outer peripheral part 75 of the spacer 70 facing the outer surface of the coil 40.
- the flow passage part itself faces the coil 40 without the insulating member 50, which can be advantageous in further improving the cooling efficiency.
- the outer peripheral surfaces 75a of the outer peripheral part 75 of the spacer 70 contact with the coil 40.
- the width W24 of the concave part 24 and the width W25 of the convex part 25 defining the shape of the flow passage part, the length L1 and the interval L2 of the concave part 143 formed on the flat wire conductor 141, or the like are constant as a whole of the flow passage part.
- the dimensions of each part are not limited to those strictly defined as described above. That is, the width W24 and the width W25 may be different in each part of the combination pattern of the concave parts 24, or the length L1 and the interval L2 of the concave parts 143 may be different in each part of the flat wire conductor 141.
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Abstract
Description
- The present disclosure relates to a stator for an electric motor and an electric motor using the stator.
- A conventional electric motor has a cooling mechanism for cooling a stator using a coolant.
Patent Literature 1 discloses a stator for an electric motor. The stator includes multiple teeth portions for each of which a winding is formed by winding a flat wire conductor in multiple rows, and a coolant flow passage is provided between the windings. - Patent Literature 1:
Japanese Unexamined Patent Application Publication No. 2004-242368 - In the stator disclosed in
Patent Literature 1, a winding is formed in rows for each teeth portion, and there is room for further improvement to increase the cooling efficiency. - An object of the present disclosure is to provide a stator advantageous for improving the cooling efficiency, and an electric motor using the stator.
- A stator according to a first aspect of the present disclosure includes a coil of a winding of a flat wire conductor, a stator core including a slot for housing a part of the coil, and a flow passage part through which a coolant flows, provided between a wall part of the slot and an outer surface of the coil facing the wall part, wherein an extension shape of the flow passage part from an inlet to an outlet for the coolant changes along an axial direction of the stator core.
- In the above-described stator, the flow passage part may be a concave part formed on the wall part of the slot. The wall part of the slot includes a wall surface adjacent to the concave part, the wall surface contacting with the coil through an insulating member. The above-described stator may include a spacer between the wall part of the slot and the outer surface of the coil facing the wall part, wherein the flow passage part may be a concave part formed on an outer peripheral part of the spacer. The concave part may be formed on the outer peripheral part of the spacer, the outer peripheral part facing the outer surface of the coil, and the outer peripheral part of the spacer includes an outer peripheral surface adjacent to the concave part, the outer peripheral surface contacting with the coil. The flat wire conductor may be stacked in layers along a radial direction orthogonal to the axial direction of the stator core, and the concave part is arranged as a plurality of concave parts, and the plurality of concave parts are opposed to each other for every layer of the flat wire conductor in the radial direction with a thickness of the flat wire conductor as one unit. The flow passage part may be a combination of a plurality of concave parts formed on a side surface part of the flat wire conductor. The side surface part of the flat wire conductor includes a side surface adjacent to each of the concave parts, the side surface contacting with the wall part of the slot through an insulating member. The flat wire conductor may be stacked in layers along a radial direction orthogonal to the axial direction of the stator core, and each of the concave parts may be formed with a thickness of the flat wire conductor as one unit in the radial direction.
- A stator according to a second aspect of the present disclosure includes a coil of a winding of a flat wire conductor, a stator core including a plurality of electromagnetic steel plates axially stacked and a slot for housing a part of the coil, and a flow passage part through which a coolant flows, formed on a wall part of the slot, wherein the electromagnetic steel plates include a plurality of concave parts formed thereon, the plurality of concave parts each having a thickness of each of the electromagnetic steel plates as one unit, the flow passage part includes a flow passage formed with a combination of the concave parts, and the concave parts are different in position, size, or number between the electromagnetic steel plates.
- In the above-described stator, the flat wire conductor may be stacked in layers along a radial direction orthogonal to the axial direction of the stator core, and a combination pattern of the concave parts may be defined in the radial direction with a thickness of the flat wire conductor as one unit. A combination pattern of the concave parts may be defined by stacking a first set of multiple electromagnetic steel plates having the same position, size, and number of concave parts and a second set of multiple electromagnetic steel plates having the same position, size, and number of concave parts, and at least one of the position, the size, or the number is different between the concave parts included in the first set and the concave parts included in the second set.
- A stator according to a third aspect of the present disclosure includes a coil of a winding of a flat wire conductor, a stator core including a slot for housing a part of the coil, and a flow passage part through which a coolant flows, formed on a side surface part of the flat wire conductor, wherein the flow passage part is a combination of a plurality of concave parts formed on the flat wire conductor.
- In the above-described stator, the flat wire conductor may be stacked in layers along a radial direction orthogonal to an axial direction of the stator core, and in the slot, a section of the flat wire conductor having concave parts formed thereon and a section of the flat wire conductor having no concave parts formed thereon may be stacked on each other.
- An electric motor according to one aspect of the present disclosure includes a stator and a rotor configured to rotate with a magnetic field generated by the stator, wherein the stator is a stator described above.
- The present disclosure provides a stator advantageous for improving cooling efficiency, and an electric motor using the stator.
-
- [
Fig. 1] Fig. 1 is a side view illustrating a configuration of an electric motor according to some embodiments of the present disclosure. - [
Fig. 2] Fig. 2 is a cross-sectional view of a stator according to a first embodiment, corresponding to a part II-II inFig. 1 . - [
Fig. 3] Fig. 3 is a cross-sectional view of a stator according to the first embodiment, corresponding to a part III-III inFig. 2 . - [
Fig. 4] Fig. 4 is a cross-sectional view of a stator according to a modification of the first embodiment. - [
Fig. 5] Fig. 5 is a cross-sectional view of a stator according to a second embodiment. - [
Fig. 6] Fig. 6 is a cross-sectional view of the stator according to the second embodiment, corresponding to a VI-VI part inFig. 5 . - [
Fig. 7] Fig. 7 is a cross-sectional view of a stator according to a modification of the second embodiment. - [
Fig. 8] Fig. 8 is a cross-sectional view of a stator according to a third embodiment. - Some exemplary embodiments are described with reference to the drawings. Here, the dimensions, materials, and specific numerical values illustrated in the respective embodiments are examples only and are not intended to limit the present disclosure unless specifically stated otherwise. Elements having substantially the same functions and configurations are denoted by the same reference numerals, and the description thereof is omitted. Elements not directly related to the present disclosure are omitted from the drawings.
-
Fig. 1 is a sectional view of the configuration of anelectric motor 1 according to some embodiments, theelectric motor 1 including any of the stators described in detail below. Theelectric motor 1 includes astator 2, arotor 3, and acase 4. Theelectric motor 1 makes therotor 3 rotate using a magnetic field generated in thestator 2. Theelectric motor 1 according to the present embodiment includes a cooling mechanism through which a coolant C flows, thereby cooling thestator 2. - The
stator 2 includes astator core 10 and acoil 40. Note that inFig. 1 , thestator core 10 drawn above therotor 3 is a cross section including thecoil 40. In contrast, thestator core 10 drawn below therotor 3 is a cross section not including thecoil 40. Thestator core 10 has a tubular shape as a whole and is a stacked body formed by stacking multipleelectromagnetic steel plates 10a in the axial direction, each of which is a board made from a magnetic body. Thecoil 40 is a winding formed by winding aflat wire conductor 41 in multiple layers. Thestator 2 according to the present embodiment includes a flow passage part through which the coolant C flows, and the specific structure and the like of thestator 2 is described in detail below. - The
rotor 3 is arranged in an inner space of thestator 2 and includes anarmature core 3a in a cylindrical shape formed by stacking multiple electromagnetic steel plates, not illustrated, in the axial direction, and a rotatingshaft 3b. Thearmature core 3a has a permanent magnet, which is not illustrated. The rotatingshaft 3b is press-fitted in an insertion hole formed in an axial center part of thearmature core 3a. - The
case 4 houses thestator 2 and therotor 3 inside with at least one end of the rotatingshaft 3b exposed to the outside. Thecase 4 is made from metal and has an outerperipheral wall part 4a, an innerperipheral wall part 4b, a firstbottom wall part 4d, and a secondbottom wall part 4e. The outerperipheral wall part 4a is a tubular member for connecting and holding thestator 2 by press-fitting the outer peripheral part of thestator 2 therein. The innerperipheral wall part 4b is a tubular member having an outer diameter and an inner diameter, which is inside the outerperipheral wall part 4a and is in a space between thestator 2 and therotor 3. The innerperipheral wall part 4b has ahole part 4c at a position substantially opposed to the inner peripheral part of thestator core 10. Thehole part 4c is filled with aresin wall 5. Here, theresin wall 5 covering thehole part 4c is in contact with thestator core 10 and is not in contact with therotor 3. The firstbottom wall part 4d is a member in a plate shape connected to one opening end of the outerperipheral wall part 4a and the innerperipheral wall part 4b through welding, for example. The firstbottom wall part 4d is provided with a first bearing 6 in an opening part thereof through which the rotatingshaft 3b penetrates. Thefirst bearing 6 rotatably supports one end of therotating shaft 3b. The secondbottom wall part 4e is a member in a plate shape, which is opposed to the firstbottom wall part 4d in the axial direction, and is connected to the other opening end of the outerperipheral wall part 4a and the innerperipheral wall part 4b through welding, for example. The secondbottom wall part 4e is provided with a second bearing 7 in an opening part thereof through which therotating shaft 3b penetrates. The second bearing 7 rotatably supports the other end of therotating shaft 3b. - Since the
stator 2 is arranged in a close manner to the outerperipheral wall part 4a and the innerperipheral wall part 4b as described above, thecase 4 has formed therein a first annular space S1 facing one end of thestator core 10 in the axial direction and a second annular space S2 facing the other end of thestator core 10 in the axial direction. Thecase 4 includes aninflow port 4f in the outerperipheral wall part 4a, which communicates with the first annular space S1 and the outside, and through which the coolant C flows in from a coolant supply unit installed outside. In contrast, thecase 4 includes anoutflow port 4g in the outerperipheral wall part 4a, which communicates with the second annular space S2 and the outside, and through which the coolant C flows out to a coolant recovery unit provided outside. Since thestator 2 has the flow passage part through which the coolant C flows, the coolant C flowing in the first annular space S1 from the outside through theinflow port 4f is introduced from the first annular space S1 to the flow passage part in thestator 2. The coolant C flowing through the flow passage part in thestator 2 is then led to the second annular space S2 on the opposite side of the first annular space S1, and finally flows out of the second annular space S2 through theoutflow port 4g. Due to the coolant C flowing in this manner, theelectric motor 1 enables the heat generated in thecoil 40 to be absorbed by the coolant C, thereby suppressing a temperature rise in thestator 2. That is, the entire flow passage of the coolant C including the flow passage part formed in thestator 2, the first annular space S1, and the second annular space S2 is the cooling mechanism included in theelectric motor 1 according to the present embodiment. - Note that the coolant C which can be employed in the present embodiment is not limited, and various coolant such as gas including nitrogen gas and oil can be employed.
- Next, the
stator 2 according to the first embodiment is described, which can be applied to theelectric motor 1 as exemplified above.Fig. 2 is a partial cross-sectional view of thestator 2 corresponding to the part II-II inFig. 1 , which is cut along a plane perpendicular to the axial direction. Note thatFig. 2 omits depictions of thecase 4 and theresin wall 5. Thestator 2 includes thestator core 10 and thecoil 40 as described above. - The
stator core 10 includesmultiple slots 23 arranged along the axial direction of thestator 2 and each housing a part of thecoil 40. Thestator core 10 is formed by combining multiple core members to mount mutually continuous parts of thecoil 40 inrespective slots 23. In the present embodiment, thestator core 10 includes multiple teeth portions 20 and a singletubular portion 30. The multiple teeth portions 20 are arranged at equal distances to the central axis of thestator core 10 and at equal intervals from each other in the circumferential direction of thestator core 10. In this case, eachslot 23 is a space formed between teeth portions 20 adjacent to each other. Thetubular portion 30 holds the multiple teeth portions 20 combined in an annular form, at the inner peripheral side of thetubular portion 30. An innerperipheral surface 21 of the annular body formed by combining the teeth portions 20 faces the outer peripheral surface of thearmature core 3a of therotor 3. In contrast, an outerperipheral surface 22 of the annular body formed by combining the teeth portions 20 contacts with the inner peripheral surface of thetubular portion 30. Each of the teeth portions 20 includes aconvex part 22a with the tip part wider than the base part on a surface facing the inner peripheral part of thetubular portion 30. In contrast, the inner peripheral part of thetubular portion 30 includes multipleconcave parts 31, which are each capable of engaging with theconvex part 22a provided in each of the teeth portions 20. Thus, it is possible for thetubular portion 30 to hold the respective teeth portions 20 in a stable manner. - Note that
Fig. 2 exemplifies as a part of thestator core 10, twoslots 23 adjacent to each other in the circumferential direction and three teeth portions forming theseslots 23, that is, afirst teeth portion 20a, asecond teeth portion 20b, and athird teeth portion 20c. - The
flat wire conductor 41 constituting thecoil 40 is stacked in layers along the radial direction orthogonal to the axial direction of thestator core 10.Fig. 2 illustrates a case where theflat wire conductor 41 is stacked in a total of eight layers in oneslot 23, as an example. That is, theflat wire conductor 41 in this example includes eight layers which are, in order from the outermost peripheral side toward the innermost peripheral side, afirst layer 41a, asecond layer 41b, athird layer 41c, afourth layer 41d, afifth layer 41e, asixth layer 41f, aseventh layer 41g, and aneighth layer 41h. Hereinafter, the thickness of theflat wire conductor 41 is referred to as T41. Theslots 23 each includes space opened from the innerperipheral surface 21 toward therotor 3. After thecoil 40 is installed in theslots 23, these spaces are filled with aresin material 60, and the coil is fixed in close contact with theslots 23. - The
stator 2 includes an insulatingmember 50 installed between thestator core 10 and thecoil 40 for eachslot 23. The insulatingmember 50 is insulating paper, for example. - The
stator 2 includes, for everyslot 23, a flow passage part through which the coolant C flows from one end in the axial direction facing the first annular space S1 toward the other end in the axial direction facing the second annular space S2. The flow passage part is provided between a wall part of theslot 23 and an outer surface of thecoil 40 facing the wall part. The wall part of theslot 23 here is basically a wall part facing the outer surface of thecoil 40 in the circumferential direction of thestator core 10. The extension shape of the flow passage part from the inlet to the outlet for the coolant C in thestator core 10 changes along the axial direction of thestator core 10. That is, when the shapes of cross sections orthogonal to the axial direction are viewed along the axial direction, the cross-sectional shapes and positions of the flow passage part change along the axial direction. In other words, the cross-sectional shapes of the flow passage part may include a region that does not change partially in the axial direction. -
Fig. 3 is a partial cross-sectional view of thestator 2 corresponding to the part III-III inFig. 2 , which is cut along a plane along the axial direction and the radial direction orthogonal to the axial direction. - The flow passage part according to the present embodiment is constituted by
concave parts 24 formed on the wall part of theslot 23. The shape of theconcave parts 24 can be set in various ways as long as the condition that the extension shape changes along the axial direction of thestator core 10 is satisfied. In an example illustrated inFig. 3 , the shape of theconcave parts 24, that is, the combination pattern of theconcave parts 24, is defined according to the following criteria. - First, the combination pattern of the
concave parts 24 may be defined in the radial direction orthogonal to the axial direction of thestator core 10 with the thickness T41 of theflat wire conductor 41 as one unit. For example, a width W24 of eachconcave part 24 in the radial direction is equal to the thickness T41 of theflat wire conductor 41. Theconcave parts 24 are opposed to each other in the radial direction for every layer of theflat wire conductor 41. For example, inFig. 2 , reference is made to theslot 23 between thefirst teeth portion 20a and thesecond teeth portion 20b. Amongconcave parts 24 formed on thefirst teeth portion 20a, fourconcave parts 24 on the part illustrated inFig. 2 each face any of the side surfaces of thefirst layer 41a, thethird layer 41c, thefifth layer 41e, and theseventh layer 41g of theflat wire conductor 41. In a similar manner, among theconcave parts 24 formed on thesecond teeth portion 20b, fourconcave parts 24 in the part illustrated inFig. 2 each face any of the side surfaces of thesecond layer 41b, thefourth layer 41d, thesixth layer 41f, and theeighth layer 41h of theflat wire conductor 41. - When the
concave parts 24 are formed as described above, multipleconvex parts 25 are adjacent to theconcave parts 24 on the wall part of theslot 23. In other words, theconvex parts 25 are parts remaining on the wall part of theslot 23 when theconcave parts 24 are formed. In the present embodiment, wall surfaces adjacent to theconcave parts 24 on the wall part of theslot 23, that is, wall surfaces 25a of theconvex parts 25, contact with thecoil 40 through the insulatingmember 50, as illustrated inFig. 2 . In this case, in the radial direction, the width W25 of eachconvex part 25 is equal to the thickness T41 of theflat wire conductor 41, and theconvex parts 25 are opposed to each other for every layer of theflat wire conductor 41. For example, inFig. 2 , reference is made to theslot 23 between thefirst teeth portion 20a and thesecond teeth portion 20b. Among the wall surfaces 25a in thefirst teeth portion 20a, fourwall surfaces 25a of the part illustrated inFig. 2 each contact with any of the side surfaces of thesecond layer 41b, thefourth layer 41d, thesixth layer 41f, and theeighth layer 41h of theflat wire conductor 41 through the insulatingmember 50. In a similar manner, among the wall surfaces 25a in thesecond teeth portion 20b, fourwall surfaces 25a of the part illustrated inFig. 2 each contact with any of the side surfaces of thefirst layer 41a, thethird layer 41c, thefifth layer 41e, and theseventh layer 41g through the insulatingmember 50. - Second, the combination pattern of the
concave parts 24 may be defined in the axial direction of thestator core 10 with the thickness T10 of each of theelectromagnetic steel plates 10a forming thestator core 10 as one unit. By combiningconcave parts 24 formed for a set ofelectromagnetic steel plates 10a, the flow passage part as a whole is formed. Note that theelectromagnetic steel plates 10a are indicated by a broken line inFig. 3 . The thickness T10 of eachelectromagnetic steel plate 10a employed in the present embodiment is about 2 mm. - In the present embodiment, the condition that the extension shape of the
concave parts 24 changes along the axial direction is satisfied by making the position, size, or number of theconcave parts 24 different for each set ofelectromagnetic steel plates 10a. In the example illustrated inFig. 3 , the combination pattern of theconcave parts 24 includes a first set U1, a second set U2, and a third set U3, each of which is composed of multipleelectromagnetic steel plates 10a and has the same position, size, and number of theconcave parts 24 formed. When the first set U1, the second set U2, and the third set U3 are compared with each other, the position, size, or number ofconcave parts 24 formed in each set is different among these sets. - Specifically, the first set U1 and the second set U2 are each a set of stacked five
electromagnetic steel plates 10a of the same shape. Here, the first set U1 and the second set U2 have the same size and number (four in the present embodiment) of theconcave parts 24, but the positions of theconcave parts 24 are displaced from each other by the width W24 of eachconcave part 24 in the radial direction of thestator core 10. That is, theconcave part 24 and theconvex part 25 are alternately present in the axial direction. Meanwhile, the third set U3 is between the first set U1 and the second set U2. Theconcave part 24 included in the third set U3 has a shape in which the entire wall part of theslot 23 facing the entire side surface of thecoil 40 is cut out. That is, theconcave part 24 formed in the third set U3 connects the fourconcave parts 24 formed in the first set U1 with the fourconcave parts 24 formed in the second set U2. - With the combination pattern of the
concave parts 24 defined as described above, the coolant C introduced into theconcave parts 24 from one side of thestator 2 in the axial direction flows toward the other side of thestator 2 in the axial direction while changing the traveling direction in a complicated manner by repeating merging and branching. - Meanwhile, the extension shape of the flow passage part in the
stator core 10 from the inlet to the outlet for the coolant C can be various other than the combination pattern of theconcave parts 24 illustrated inFig. 3 . -
Fig. 4 is a diagram illustrating a combination pattern of theconcave parts 24 as another example according to the present embodiment, in which the combination pattern of theconcave parts 24 illustrated inFig. 3 is modified. Note thatFig. 4 is a partial cross-sectional view of thestator 2 in accordance withFig. 3 . - As with the first set U1, second set U2, and third set U3 described above, in the example illustrated in
Fig. 4 , the combination pattern of theconcave parts 24 includes a first set U11, a second set U12, and a third set U13. Specifically, the first set U11 and the second set U12 are each a set of five stackedelectromagnetic steel plates 10a of the same shape. Here, the first set U11 and the second set U12 have the same size and number (two in the present embodiment) of theconcave parts 24, but the positions of theconcave parts 24 are displaced from each other by the width W24 of eachconcave part 24 in the radial direction of thestator core 10. That is, theconcave part 24 and theconvex part 25 are alternately present in the axial direction. Meanwhile, the third set U13 is between the first set U11 and the second set U12. Theconcave part 24 included in the third set U13 has a shape necessary for connecting oneconcave part 24 formed in the first set U11 with oneconcave part 24 formed in the second set U12. In particular, the combination pattern of theconcave parts 24 illustrated inFig. 4 can include a part where theconcave part 24 does not face any layers of theflat wire conductor 41. Referring to the drawing ofFig. 4 , the wall part of theslot 23 in thefirst teeth portion 20a has noconcave parts 24 formed at parts, which face any of thefirst layer 41a, thesecond layer 41b, thesixth layer 41f, and theseventh layer 41g of theflat wire conductor 41. - According to the combination pattern of the
concave parts 24 illustrated inFig. 4 , the coolant C introduced into theconcave parts 24 from one side of thestator 2 in the axial direction flows toward the other side of thestator 2 in the axial direction while meandering. - Next, the operation and effect of the
stator 2 and theelectric motor 1 using thestator 2 are described. - The
stator 2 according to the present embodiment includes thecoil 40 of a winding of theflat wire conductor 41, and thestator core 10 having theslots 23 for housing a part of thecoil 40. Thestator 2 includes the flow passage part through which the coolant C flows between the wall part of theslot 23 and the outer surface of thecoil 40 facing the wall part. The extension shape of the flow passage part from the inlet to the outlet for the coolant C changes along the axial direction of thestator core 10. - First, the
stator 2 enables the coolant C to flow through the flow passage part included in thestator core 10, and thus enables the heat generated in thecoil 40 to be absorbed by the coolant C, thereby cooling thestator 2. - In the
stator 2, the extension shape of the flow passage part from the inlet to the outlet for the coolant C changes along the axial direction of thestator core 10. Thus, the flow of the coolant C is more likely to be turbulence than in a case where the flow passage part extends linearly, for example, and the flow passage part is more likely to crawl widely to fit the outer surface shape of thecoil 40, thereby improving the cooling efficiency. - As described above, the present embodiment provides the
stator 2 advantageous to improve the cooling efficiency. - In the
stator 2 according to the present embodiment, the flow passage part is provided between the wall part of theslot 23 and the outer surface of thecoil 40 facing the wall part. Thus, as compared with a case where the flow passage part according to the present embodiment does not exist, there is no need to change the shape of components in thestator 2 to a large extent, or there is no need in some cases to increase the number of components in thestator 2. - The
electric motor 1 according to the present embodiment includes thestator 2 and therotor 3 to be rotated using a magnetic field generated by thestator 2. - The present embodiment provides the
electric motor 1 advantageous to improve the cooling efficiency as theelectric motor 1 includes thestator 2 achieving the effect described above. Theelectric motor 1 as described above can be advantageous for miniaturization and high output, accordingly. - In the
stator 2, the flow passage part may beconcave parts 24 formed on the wall part of theslot 23. - In the
stator 2 described above, since theconcave parts 24 are formed on the wall part of theslot 23, it is easy to set the shape of theconcave parts 24 to a desired shape. In this case, additional components are not necessary when the flow passage part is provided in thestator 2, which can contribute to the simplification of the structure of thestator 2. - In the
stator 2, the wall surfaces 25a adjacent to theconcave parts 24 in the wall part of theslot 23 may contact with thecoil 40 through the insulatingmember 50. - In the
stator 2 as described above, thestator core 10 firmly supports thecoil 40 even when the flow passage part is provided between the wall part of theslot 23 and the outer surface of thecoil 40. - In the
stator 2, theflat wire conductor 41 is stacked in layers along the radial direction orthogonal to the axial direction of thestator core 10. Here, theconcave parts 24 may be opposed to each other for every layer of theflat wire conductor 41 with the thickness T41 of theflat wire conductor 41 as one unit in the radial direction. - In the
stator 2 as described above, each of theconcave parts 24 directly faces any of the multiple layers of theflat wire conductor 41, each layer being an individual heat source, thereby further improving the cooling efficiency. - The
stator 2 according to the present embodiment includes thecoil 40 of a winding of theflat wire conductor 41, and thestator core 10 having theslot 23 for housing a part of thecoil 40 and formed by stacking multipleelectromagnetic steel plates 10a together in the axial direction. Thestator 2 includes the flow passage part formed on the wall part of theslot 23 and through which the coolant C flows. Theconcave parts 24 each having the thickness T10 of theelectromagnetic steel plate 10a as one unit are formed on theelectromagnetic steel plates 10a. The flow passage part includes a flow passage formed with a combination of theconcave parts 24. The position, size, or number ofconcave parts 24 is different for each set ofelectromagnetic steel plates 10a. - In the
stator 2 described above, the flow passage part is defined with the thickness T10, as one unit, of theelectromagnetic steel plate 10a forming thestator core 10, and thus it is easy to determine the shape of the flow passage part when thestator core 10 is manufactured. Note that regarding the timing when theconcave parts 24 are formed on the individualelectromagnetic steel plates 10a, theconcave parts 24 may be formed on theelectromagnetic steel plates 10a before thestator core 10 is assembled, or theconcave parts 24 may be formed after thestator core 10 is assembled. Since the position, size, or number of theconcave parts 24 is different for each set ofelectromagnetic steel plates 10a, even when the multipleconcave parts 24 formed in each set ofelectromagnetic steel plates 10a are combined to form the flow passage part, the extension shape of the flow passage part is not at least in a linear shape. It is thus possible to make the extension shape of the flow passage part from the inlet to the outlet for the coolant C varied along the axial direction of thestator core 10 in a reliably manner. - In the
stator 2, theflat wire conductor 41 is stacked in layers along the radial direction orthogonal to the axial direction of thestator core 10. In this case, the combination pattern of theconcave parts 24 may be defined with the thickness T41 of theflat wire conductor 41 as one unit in the radial direction. - In the
stator 2 described above, even when the thickness T10 of theelectromagnetic steel plate 10a is defined as one unit for theconcave parts 24, it is possible to form theconcave parts 24 to directly face multiple layers of theflat wire conductor 41, each of which is an individual heat source. - In the
stator 2, the combination pattern of theconcave parts 24 is defined by stacking the first set of multipleelectromagnetic steel plates 10a having the same position, size, and number ofconcave parts 24, and the second set ofelectromagnetic steel plates 10a having the same position, size, and number ofconcave parts 24. Here, at least one of the position, size, or number may be different from each other between theconcave parts 24 included in the first set and theconcave parts 24 included in the second set. - In the
stator 2 described above, for example, before thestator core 10 is assembled, it is possible to prepare in advanceelectromagnetic steel plates 10a having a shape for the first set andelectromagnetic steel plates 10a having a shape for the second set. In this way, by preparing some sets ofelectromagnetic steel plates 10a each havingconcave parts 24 of a specific shape, it is then possible to combine theelectromagnetic steel plates 10a to easily manufacture thestator core 10 including the flow passage part formed of a combination of theconcave parts 24. - Next, a
stator 102 according to the second embodiment is described, which can be applied to theelectric motor 1 as exemplified above.Fig. 5 is a partial cross-sectional view of thestator 102 contrasted withFig. 2 of the first embodiment, which is cut along a plane perpendicular to the axial direction.Fig. 6 is a partial cross-sectional view of thestator 102 corresponding to the part VI-VI inFig. 5 , which is cut along a plane along the axial direction and the radial direction orthogonal to the axial direction. Note that inFigs. 5 and6 , the same components as those of thestator 2 according to the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. - As with the
stator 2 according to the first embodiment, thestator 102 includes, for everyslot 123, a flow passage part through which the coolant C flows from one end in the axial direction facing the first annular space S1 toward the other end in the axial direction facing the second annular space S2. Also in the present embodiment, the flow passage part is provided between the wall part of theslot 123 and the outer surface of thecoil 140 facing the wall part. The extension shape of the flow passage part from the inlet to the outlet for the coolant C changes along the axial direction of thestator core 110. The flow passage part in the first embodiment isconcave parts 24 formed on the wall part of theslot 23. In contrast, the flow passage part according to the present embodiment is a combination of multipleconcave parts 143 formed on the side surface part of the flat wire conductor 141. - The
stator core 110 is a member corresponding to thestator core 10 in the first embodiment. The basic structure of thestator core 110 is equivalent to that of thestator core 10. However, as in thefirst teeth portion 120a, thesecond teeth portion 120b, and thethird teeth portion 120c illustrated inFig. 5 , the multiple teeth portions 120 included in thestator core 110 do not have concave parts formed thereon as the flow passage part. - The
coil 140 is a member corresponding to thecoil 40 in the first embodiment. The flat wire conductor 141 constituting thecoil 140 is stacked in layers along the radial direction orthogonal to the axial direction of thestator core 110. Here,Fig. 5 exemplifies as an example a case where the flat wire conductor 141 is stacked in a total of eight layers in oneslot 123. That is, the flat wire conductor 141 includes eight layers in order from the outermost peripheral side toward the innermost peripheral side, afirst layer 141a, asecond layer 141b, athird layer 141c, afourth layer 141d, afifth layer 141e, asixth layer 141f, aseventh layer 141g, and aneighth layer 141h. Hereinafter, the thickness of the flat wire conductor 141 is referred to as T141 (seeFig. 6 ). - The shape of the multiple
concave parts 143 formed on the flat wire conductor 141 can be set in various ways as long as the condition that the extension shape of the flow passage part changes along the axial direction of thestator core 110 is satisfied. In the example illustrated inFig. 6 , the shape of theconcave part 143 is defined according to the following criteria. - First, the multiple
concave parts 143 may be defined in the stacking direction of the flat wire conductor 141 with the thickness T141 of the flat wire conductor 141 as one unit. That is, each of theconcave parts 143 is formed by cutting out the side surface part of the flat wire conductor 141 along the stacking direction as a whole. - Second, in the axial direction of the
stator core 110, multipleconcave parts 143 may be defined by a constant length L1 with a constant interval L2 between adjacentconcave parts 143. Here, the interval L2 is shorter than the length L1. As illustrated inFig. 6 , when thecoil 140 is formed by winding the flat wire conductor 141, the length L1 and the interval L2 are defined such that multipleconcave parts 143 are aligned in every other layer in the stacking direction from thefirst layer 141a to theeighth layer 141h. - Here, attention is paid to one layer (hereinafter referred to as "upper layer") and the other layer (hereinafter referred to as "lower layer"), including a part overlapped at a position adjacent to each other in the stacking direction, among the respective layers of the flat wire conductor 141. The
concave parts 143 formed on the upper layer and theconcave parts 143 formed on the lower layer overlap each other in the stacking direction. For example, with reference toFig. 6 , when the upper layer is thefirst layer 141a and the lower layer is thesecond layer 141b, theconcave part 143 formed on thefirst layer 141a and theconcave part 143 formed on thesecond layer 141b overlap each other in a first region R1. This enables the coolant C to flow in the stacking direction. - Since the flow passage changes in the axial direction, as illustrated in
Fig. 6 , the flow passage may include a second region R2 in which theconcave part 143 of the upper layer and theconcave part 143 of the lower layer do not overlap each other in the stacking direction. That is, a part of theconcave part 143 of the lower layer can cover the convex part protruding toward theconcave part 143 of the upper layer. - Further, the flow passage may include a pattern in which one
concave part 143 of the lower layer covers multipleconcave parts 143 of the upper layer. - Side surfaces 142 adjacent to
concave parts 143 in the side surface part of the flat wire conductor 141, that is, side surfaces each represented by the interval L2, contact with the wall part of theslot 123 through the insulatingmember 50. - With the combination of the multiple
concave parts 143 defined as described above, the coolant C introduced into theconcave parts 143 from one side of thestator 102 in the axial direction flows toward the other side of thestator 102 in the axial direction while changing the traveling direction in a complicated manner by repeating merging and branching. - Meanwhile, the extension shape of the flow passage part in the
stator core 110 from the inlet to the outlet for the coolant C can be various other than the combination of theconcave parts 143 illustrated inFig. 6 . -
Fig. 7 is a diagram illustrating a combination pattern of theconcave parts 143 as another example according to the present embodiment, in which the combination of theconcave parts 143 illustrated inFig. 6 is modified. Note thatFig. 7 is a partial cross-sectional view of thestator 102 in accordance withFig. 6 . - In the example illustrated in
Fig. 7 , in oneslot 123, a section of the flat wire conductor 141 withconcave parts 143 formed in the same manner as inFig. 6 and a section of the flat wire conductor 141 with no concave parts formed are stacked on each other. Referring to the drawing ofFig. 7 , in theslot 123 in thesecond teeth portion 120b, no concave parts are formed on thefirst layer 141a, thesecond layer 141b, thefifth layer 141e, and thesixth layer 141f of the flat wire conductor 141. - In the combination of
concave parts 143 illustrated inFig. 7 , the coolant C introduced into theconcave parts 143 from one side of thestator 102 in the axial direction flows toward the other side of thestator 102 in the axial direction while meandering. - As an action and effect of the
stator 102 described above, it is possible to provide the flow passage part between the wall part of theslot 23 and the outer surface of thecoil 40 facing the wall part, as with thestator 2 according to the first embodiment. It is possible to change the extension shape of the flow passage part from the inlet to the outlet for the coolant C along the axial direction of thestator core 110. Therefore, the present embodiment provides thestator 102 advantageous for improving the cooling efficiency. - In the
stator 102, the flow passage part may be a combination of multipleconcave parts 143 formed on the side surface part of the flat wire conductor 141. - In the
stator 102, since the processing for providing the flow passage part is only the processing for forming theconcave parts 143 on the side surface part of the flat wire conductor 141, it is easy and simple to form the flow passage part. - In the
stator 102, the side surfaces 142 adjacent to theconcave parts 143 in the side surface part of the flat wire conductor 141 may contact with the wall part of theslot 123 through the insulatingmember 50. - The
stator 102 described above enables thestator core 110 to firmly support thecoil 140 even when the flow passage part is provided between the wall part of theslot 123 and the outer surface of thecoil 140. In this case, the flow passage part itself faces thecoil 140 without the insulatingmember 50, which can be advantageous to further improve the cooling efficiency. - Further, in the
stator 102, the flat wire conductor 141 is stacked in layers along the radial direction orthogonal to the axial direction of thestator core 110. Here, theconcave part 143 may be formed with the thickness T141 of the flat wire conductor 141 as one unit in the radial direction. - The
stator 102 according to the present embodiment includes thecoil 140 of a winding of the flat wire conductor 141, and thestator core 110 including theslot 123 for housing a part of thecoil 140. Thestator 102 includes the flow passage part through which the coolant C flows, which is formed on the side surface part of the flat wire conductor 141. The flow passage part is a combination of multipleconcave parts 143 formed on the flat wire conductor 141. - In the
stator 102 described above, theconcave part 143 has a shape in which the side surface part of the flat wire conductor 141 is entirely cut off along the stacking direction, which enables the coolant C to flow across oneconcave part 143 in the stacking direction. Therefore, combining multipleconcave parts 143 described above makes it easy to construct the flow passage part continuous as a whole. - In the
stator 102, the flat wire conductor 141 is stacked in layers along the radial direction orthogonal to the axial direction of thestator core 110. Here, in theslot 123, a section of the flat wire conductor 141 withconcave parts 143 formed and a section of the flat wire conductor 141 with no concave parts formed may be stacked on each other. - With the
stator 102 described above, it is possible to widen the range of choice in the shape of the flow passage part, for example, by making the shape of the flow passage part as a meandering shape as illustrated inFig. 7 . - Next, a
stator 202 according to the third embodiment is described, which can be applied to theelectric motor 1 as exemplified above.Fig. 8 is a partial cross-sectional view of thestator 202 contrasted withFig. 2 of the first embodiment orFig. 6 of the second embodiment, which is cut along a plane perpendicular to the axial direction. Note that inFig. 8 , the same components as those of thestator 2 according to the first embodiment or thestator 102 according to the second embodiment are denoted by the same reference numerals, and description thereof is omitted. - As with the
stator 2 according to the first embodiment, thestator 202 includes, for everyslot 123, the flow passage part through which the coolant C flows from one end in the axial direction facing the first annular space S1 toward the other end in the axial direction facing the second annular space S2. Also in the present embodiment, the flow passage part is provided between the wall part of theslot 123 and the outer surface of thecoil 40 facing the wall part. The extension shape of the flow passage part from the inlet to the outlet for the coolant C changes along the axial direction of thestator core 110. Here, thestator 202 includes for each slot 123 aspacer 70 between the wall part of theslot 123 and the outer surface of thecoil 40 facing the wall part. In the present embodiment, the flow passage part isconcave parts 74 formed on the outer peripheral part of thespacer 70. The combination pattern of theconcave parts 74 may be, for example, the same as the combination pattern of theconcave parts 24 in the first embodiment. - In the
stator 202 according to the present embodiment, although the number of components increases as thespacer 70 is provided, no flow passage part is formed in thestator core 110, nor in thecoil 40. Therefore, for example, theelectric motor 1 as a whole can be advantageous in terms of time and labor required for manufacturing, consequently in terms of manufacturing cost. - In the
stator 202, theconcave parts 74 may be formed on the outerperipheral part 75 of thespacer 70, facing the outer surface of thecoil 40, and outerperipheral surfaces 75a adjacent to theconcave parts 74 on the outerperipheral part 75 may contact with thecoil 40. - In the
stator 202 described above, theconcave parts 74 are formed on the outerperipheral part 75 of thespacer 70 facing the outer surface of thecoil 40. Thus, the flow passage part itself faces thecoil 40 without the insulatingmember 50, which can be advantageous in further improving the cooling efficiency. The outerperipheral surfaces 75a of the outerperipheral part 75 of thespacer 70 contact with thecoil 40. Thus, it is possible for thestator core 110 to firmly support thecoil 40 even when thespacer 70 is provided. - Note that in each of the above embodiments, the width W24 of the
concave part 24 and the width W25 of theconvex part 25 defining the shape of the flow passage part, the length L1 and the interval L2 of theconcave part 143 formed on the flat wire conductor 141, or the like are constant as a whole of the flow passage part. However, in thestator 2 and the like according to the present disclosure, the dimensions of each part are not limited to those strictly defined as described above. That is, the width W24 and the width W25 may be different in each part of the combination pattern of theconcave parts 24, or the length L1 and the interval L2 of theconcave parts 143 may be different in each part of the flat wire conductor 141. - Although some embodiments have been described, it is possible to modify or vary embodiments based on the above disclosure. All of the components of each of the above embodiments and all of the features described in the claims may be individually extracted and combined as long as they do not contradict each other.
- The entire contents of
Japanese Patent Application No. 2020-086027 (filed on May 15, 2020 -
- 1
- Electric motor
- 2
- Stator
- 3
- Rotor
- 10
- Stator core
- 10a
- Electromagnetic steel plate
- 23
- Slot
- 24
- Concave part
- 25a
- Wall surface
- 40
- Coil
- 41
- Flat wire conductor
- 50
- Insulating member
- 70
- Spacer
- 74
- Concave part
- 75
- Outer peripheral part of the spacer
- 75a
- Outer peripheral surface of the spacer
- 102
- Stator
- 110
- Stator core
- 123
- Slot
- 140
- Coil
- 141
- Flat wire conductor
- 142
- Side surface of the flat wire conductor
- 143
- Concave part
- 202
- Stator
- C
- Coolant
- T10
- Thickness of the electromagnetic steel plate
- T41
- Thickness of the flat wire conductor
- T141
- Thickness of the flat wire conductor
Claims (15)
- A stator for an electric motor, comprising:a coil of a winding of a flat wire conductor;a stator core including a slot for housing a part of the coil; anda flow passage part through which a coolant flows, provided between a wall part of the slot and an outer surface of the coil facing the wall part;wherein an extension shape of the flow passage part from an inlet to an outlet for the coolant changes along an axial direction of the stator core.
- The stator for an electric motor according to claim 1, wherein
the flow passage part is a concave part formed on the wall part of the slot. - The stator for an electric motor according to claim 2, wherein
the wall part of the slot includes a wall surface adjacent to the concave part, the wall surface contacting with the coil through an insulating member. - The stator for an electric motor according to claim 1, further comprising:a spacer between the wall part of the slot and the outer surface of the coil facing the wall part,wherein the flow passage part is a concave part formed on an outer peripheral part of the spacer.
- The stator for an electric motor according to claim 4, whereinthe concave part is formed on the outer peripheral part of the spacer, the outer peripheral part facing the outer surface of the coil, andthe outer peripheral part of the spacer includes an outer peripheral surface adjacent to the concave part, the outer peripheral surface contacting with the coil.
- The stator for an electric motor according to any one of claims 2 to 5, whereinthe flat wire conductor is stacked in layers along a radial direction orthogonal to the axial direction of the stator core, andthe concave part is arranged as a plurality of concave parts, and the plurality of concave parts are opposed to each other for every layer of the flat wire conductor in the radial direction with a thickness of the flat wire conductor as one unit.
- The stator for an electric motor according to claim 1, wherein
the flow passage part is a combination of a plurality of concave parts formed on a side surface part of the flat wire conductor. - The stator for an electric motor according to claim 7, wherein
the side surface part of the flat wire conductor includes a side surface adjacent to each of the concave parts, the side surface contacting with the wall part of the slot through an insulating member. - The stator for an electric motor according to claim 7 or 8, whereinthe flat wire conductor is stacked in layers along a radial direction orthogonal to the axial direction of the stator core, andeach of the concave parts is formed with a thickness of the flat wire conductor as one unit in the radial direction.
- A stator for an electric motor, comprising:a coil of a winding of a flat wire conductor;a stator core including a plurality of electromagnetic steel plates axially stacked and a slot for housing a part of the coil; anda flow passage part through which a coolant flows, formed on a wall part of the slot,wherein the electromagnetic steel plates include a plurality of concave parts formed thereon, the plurality of concave parts each having a thickness of each of the electromagnetic steel plates as one unit,the flow passage part includes a flow passage formed with a combination of the concave parts, andthe concave parts are different in position, size, or number between the electromagnetic steel plates.
- The stator for an electric motor according to claim 10, whereinthe flat wire conductor is stacked in layers along a radial direction orthogonal to the axial direction of the stator core, anda combination pattern of the concave parts is defined in the radial direction with a thickness of the flat wire conductor as one unit.
- The stator for an electric motor according to claim 10 or 11, whereina combination pattern of the concave parts is defined by stacking a first set of multiple electromagnetic steel plates having the same position, size, and number of concave parts and a second set of multiple electromagnetic steel plates having the same position, size, and number of concave parts, andat least one of the position, the size, or the number is different between the concave parts included in the first set and the concave parts included in the second set.
- A stator for an electric motor, comprising:a coil of a winding of a flat wire conductor;a stator core including a slot for housing a part of the coil; anda flow passage part through which a coolant flows, formed on a side surface part of the flat wire conductor,wherein the flow passage part is a combination of a plurality of concave parts formed on the flat wire conductor.
- The stator for an electric motor according to claim 13, whereinthe flat wire conductor is stacked in layers along a radial direction orthogonal to an axial direction of the stator core, andin the slot, a section of the flat wire conductor having concave parts formed thereon and a section of the flat wire conductor having no concave parts formed thereon are stacked on each other.
- An electric motor, comprising:a stator; anda rotor configured to rotate with a magnetic field generated by the stator,wherein the stator is a stator according to any one of claims 1 to 14.
Applications Claiming Priority (2)
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JP2020086027 | 2020-05-15 | ||
PCT/JP2021/006975 WO2021229888A1 (en) | 2020-05-15 | 2021-02-25 | Electric motor stator and electric motor |
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EP4152566A1 true EP4152566A1 (en) | 2023-03-22 |
EP4152566A4 EP4152566A4 (en) | 2024-06-26 |
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EP21804818.9A Pending EP4152566A4 (en) | 2020-05-15 | 2021-02-25 | Electric motor stator and electric motor |
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US (1) | US20220385123A1 (en) |
EP (1) | EP4152566A4 (en) |
JP (1) | JP7355236B2 (en) |
WO (1) | WO2021229888A1 (en) |
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JP7531429B2 (en) * | 2021-03-05 | 2024-08-09 | 本田技研工業株式会社 | Rotating Electric Machine |
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Publication number | Priority date | Publication date | Assignee | Title |
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GB2289992B (en) * | 1994-05-24 | 1998-05-20 | Gec Alsthom Ltd | Improvements in or relating to cooling arrangements in rotating electrical machines |
JPH10234157A (en) * | 1997-02-19 | 1998-09-02 | Toshiba Corp | Motor |
JPH11103549A (en) * | 1997-09-28 | 1999-04-13 | Sanyo Electric Co Ltd | Motor blower |
JP2912335B1 (en) * | 1998-02-16 | 1999-06-28 | 埼玉日本電気株式会社 | Receiving machine |
JP2004242368A (en) | 2003-02-03 | 2004-08-26 | Nissan Motor Co Ltd | Stator for motor and motor |
JP2011193571A (en) * | 2010-03-12 | 2011-09-29 | Nippon Soken Inc | Rotary electric machine |
WO2018154944A1 (en) * | 2017-02-21 | 2018-08-30 | パナソニックIpマネジメント株式会社 | Motor |
JP7284570B2 (en) | 2018-11-20 | 2023-05-31 | 東京瓦斯株式会社 | Sound reproduction system and program |
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2021
- 2021-02-25 WO PCT/JP2021/006975 patent/WO2021229888A1/en active Application Filing
- 2021-02-25 JP JP2022522526A patent/JP7355236B2/en active Active
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JPWO2021229888A1 (en) | 2021-11-18 |
US20220385123A1 (en) | 2022-12-01 |
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